https://www.mangago.zone/read-manga/taming_the_possessive_girl/
Pretty sure it's this. 2 Babies later, red-haired fl anc both fl and ml are leaders of secret organisations. None of them is mafia though fl's secret organisation is clearly a criminal organisation while ml's is more a gray special military organisation.
There's another webtoon where fl saves ml's brother by racing and both ml & fl do each their own secret operations but her hair color doesn't fit and they don'thave babiss yet, but fl has a cute brother. It's
https://www.mangago.zone/read-manga/madam_and_her_daily_online_face_slapping/
(it has over 100chapters at manhuasy, but take care to read the new version, the older one was dropped)
Tryna find sumthing that i used to read on webcomics, i forgot the title but the girl is red haired and the guy is black haired. They both hidden leader of like some sort of mafia shit and they had two babies?? I cant remember much accept the fact that the red haired girl is a good racer that helps win the male leads brother